30 

 TABLE VIII. 







Showing the solubility of certain resinous substances in 

 Eucalyptine Oils. 



NOTE. Only three of the Essential Oils have here been enumerated, 

 these being deemed sufficient to give a general idea of the solvent 

 p'ower of these bodies. Blanks indicate that no experiment was in- 

 stituted. The experiments were conducted at the ordinary tempera- 

 ture. 



V. MANNA. 



There are two varieties of a substance called Manna. The 

 one is secreted by the leaves and slender twigs of the E. Vimi- 

 nalis (Manna Eucalypt) from punctures or injuries done to 

 these parts of the tree. It occurs most commonly in the form 

 of irregular little rounded masses of an opaque white color, 

 possessing a pleasant sweetish taste. These little masses often 

 present an aperture at one end, shewing the attachment of the 

 small twig from which the Manna has been secreted in a liquid 

 form, at first transparent and of the consistence of thin honey, 

 and then becoming solid, drops off.in the condition that has been 

 mentioned. 



This Manna has been examined by Johnston, who found it to 

 contain a crystallisable sugar (Melitose,) containing according 



